Final answer:
The normal number of Luquillo sites per cubic meter can vary depending on the specific context. In microbial studies in the Luquillo rainforest, the number of microbial communities per cubic meter can range from millions to billions.
Step-by-step explanation:
The normal number of Luquillo sites per cubic meter can vary depending on the specific context. It is important to note that without additional information, it is not possible to provide an exact answer. However, in the context of microbial studies in the Luquillo rainforest, research has shown that the number of microbial communities per cubic meter can range from millions to billions.